练习材料：

Lesson43 Over the South Pole

In 1929, three years after his flight over the North Pole, the American explorer, R. E.  Byrd,  successfully flew over the South Pole for the first time. Though, at first, Byrd and his men were able to take a great many photographs of the mountains that lay below,  they  soon  ran  into serious trouble. At one point, it seemed certain that their plane would crash.  It could  only  get over the mountains if it rose to 10,000 feet. Byrd at once ordered his men to throw  out  two heavy food sacks. The plane was then able to rise and it cleared the mountains  by 400  feet. Byrd now knew that he would be able to reach the South Pole which was 300 miles  away,  for there were no more mountains in sight. The aircraft was able to fly over the endless white plains without difficulty.

任务配置：L0+L4

练习感悟：感觉还是不太会用腹部的力量，有的时候掌握不好长句的节奏，继续加油吧。